bash 脚本执行日期/时间
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bash script execution date/time
提问by Daniil
I'm trying to figure this out on and off for some time now. I have a bash script in Linux environment that, for safety reasons, I want to prevent from being executed say between 9am and 5pm unless a flag is given. So if I do ./script.sh between 9am and 5pm it would say "NO GO", but if I do ./script.sh -force it would bypass the check. Basically making sure the person doesn't do something by accident. I've tried some date commands, but can't wrap that thing around my mind. Could anyone help out?
我现在正试图断断续续地弄清楚这一点。我在 Linux 环境中有一个 bash 脚本，出于安全原因，我想防止在上午 9 点到下午 5 点之间执行，除非给出标志。因此，如果我在上午 9 点到下午 5 点之间执行 ./script.sh，它会说“NO GO”，但如果我执行 ./script.sh -force 它将绕过检查。基本上确保这个人不会意外地做某事。我已经尝试了一些日期命令，但无法将那件事环绕在我的脑海中。有人可以帮忙吗？
采纳答案by Ignacio Vazquez-Abrams
Write a function. Use date +"%k"to get the current hour, and (( ))to compare it.
写一个函数。使用date +"%k"得到当前小时，(( ))以进行比较。
回答by Jonathan Leffler
Basic answer:
基本答案：
case "" in
(-force)
: OK;;
(*)
case $(date +'%H') in
(09|1[0-6])
echo "Cannot run between 09:00 and 17:00" 1>&2
exit 1;;
esac;;
esac
Note that I tested this (a script called 'so.sh') by running:
请注意，我通过运行测试了这个（一个名为“so.sh”的脚本）：
TZ=US/Pacific sh so.sh
TZ=US/Central sh so.sh
It worked in Pacific time (08:50) and not in Central time (10:50). The point about this is emphasizing that your controls are only as good as your environment variables. And users can futz with environment variables.
它适用于太平洋时间 (08:50) 而不是中部时间 (10:50)。关于这一点的重点是强调您的控件仅与您的环境变量一样好。用户可以使用环境变量进行测试。
回答by Keith Reynolds
This works
这有效
#!/bin/bash
# Ensure environmental variable runprogram=yes isn't set before
unset runprogram
# logic works out to don't run if between 9 and 5pm as you requested
[ $(date "+%k") -le 9 -a $(date +"%k") -ge 17 ] && runprogram=yes
# Adding - avoids the need to test if the length of is zero
[ "${}-" = "-forced-" ] && runprogram=yes
if [ "${runprogram}-" = "yes-" ]; then
run_program
else
echo "No Go" 1>&2 #redirects message to standard error
fi
回答by Eduardo
Test script:
测试脚本：
#!/bin/bash
HOUR=$(date +%k)
echo "Now hour is $HOUR"
if [[ $HOUR -gt 9 ]] ; then
echo 'after 9'
fi
if [[ $HOUR -lt 23 ]]; then
echo 'before 11 pm'
fi
